A 54-Year-Old Man with Tracheomegaly, Tracheal Diverticulas and Bronchiectasis--Mounier-Kuhn Syndrome.

Mounier-Kuhn syndrome is a rare idiopathic clinical, radiological and bronchoscopic disorder characterised by abnormal dilatation of the tracheo-bronchial tree. The usual presentation is with recurrent lower respiratory tract infections. Herein, we report the case of an adult male who was diagnosed to have Mounier-Kuhn syndrome based on radiographic finding of a tracheal diameter of 45.5 mm on computed tomography and dynamic complete collapse of the tracheo-bronchial tree on forced expiration, observed during ronchoscopy.